Fire-extinguisher



(No Model.)

C. M. MARTIN. PIRE BXTINGUISHER.

Patented July 8 WITNESSES;

fu: News Patins cn.. moro-urne., wnsremswu, n. c.

UNITED ASTATES PATENT OFFICE..

CHARLES M. MARTIN, OF IVASHINGTON, DISTRICT OE COLUMBIA, ASSIGNOR TO THEFIRE-EXTINGUISHER COMPANY OF AMERICA, OF PHILADELPHIA,

PENNSYLVANIA.

FIRE-EXTINGUISHER.

SPECIFICATION forming part of Letters Patent No. 431,950, dated July8,1890.

Application filed October 11, 1889. Serial No. 326,721. (No model.)

' To alZ whom it may concern.:

Be it known that I, CHARLES M. MARTIN, a citizen of the United States ofAmerica, residing at Washington, District of Columbia,

have invented certain new and useful Improvements in Fire-Extinguishers,of which the following is a specification, reference being had thereinto the accompanying drawing.

My invention relates to fire-extinguishers,

1o and especially to that class in which the iireextinguishing solutionis discharged by airpressure in contradistinction to those in which thesolution is discharged by the pressure of gases generated within thecylinder by I5 a mixture of gas-generating agents.

It has for its object to facilitate the charging of the apparatus withthe lire-extinguishing compound and with compressed air for dischargingthe same; and it consists in the construction and arrangementhereinafter described and claimed.

The accompanying drawing, which illustrates my invention and forms apart of this specification, is an elevation, partly in sec- 2 5 tion, ofa cylinder or reservoir constructed according to my invention.

A designates the cylinder or reservoir for containing a chemicaliire-extinguishin g compound. It has two openings or passagesone throughthe bottom, for the introduction vof chemicals and air, and the otherthrough the side wall near the bottom, for the discharge of theextinguishing agent. The bottom a is inwardly dished or concave and has3 5 a central opening 0 for the introduction into the cylinder of thechemical solution which is to be used as the extinguishing agent. Whenthe cylinder is inverted, the concave bottom serves as a funnel, intowhich the chemical mixture is poured, and'from which it enters thecylinder through the central opening 0. The opening in the bottom isfitted with a hollow screw-plug p, the inner end of which carries aflap-valve fu. The outer end of the plug p projects from the bottom andis screw-threaded for the attachment of an air-pump, (shown in dottedlnes,)

which may be of any ordinary or preferred construction. The plug p isremoved for the o introduction of the chemical solution, and after thelatter has been introduced the plug is screwed into the opening in thebottom and the air-pump is attached. The air-pump being operated, air isforced into the cylinder through the hollow plug p, the valve r openingfor its admission,4 but closing by the pressure within to prevent itsescape. When sufficient air has been pumped in to give the requisitepressure, the air-pump is detached and a protecting screw-cap cisscrewed upon the plug p.. VV'hen the cylinder after being charged isturned into its proper vertical position, the chemical solution takesits place at the bottom and the air at the top, the latter thus exertinga downward pressure to force the fire-extinguishing compound out througha nozzle n, which is fitted to the opening in the side wall near thebottom. This nozzle is provided with a stop-cock n to control andregulate the iiow of the solution 7o with which the apparatus ischarged.

Having now described my invention, I claiml. A tire-extinguisher havingan opening in the side wall and discharge-nozzle and a concave bottomintegral with the body of the cylinder, said bottom having a centralprojecting screw-threading boss and a hollow screw-plug fitting saidboss and adapted to receive an air-pump, substantially as and for 8o thepurpose described.

2. A fire-extinguisher cylinder having an opening in one end, saidopening being fitted with a removable hollow screw-plug, the outer endof which projects to permit the attachment of an air-pump, and the innerend ot' which is provided with an inwardly-opening valve, substantiallyas described, and for the purposes stated.

3. A fire-extinguisher cylinder having an inwardly-dished or concavebottom in which there is a central opening, said opening being ittedwith a removable hollow screw-plug, the outer end ot' which projectsfrom the bottom to permit the attachment of an air-pump, and 95 theinner end of which is provided with an inwardly-opening Hap-valve,substantially as and for the purposes described.

In testimony whereof Iaftix my signature in presence of two witnesses.

CHARLES M. MARTIN.

Vitnesses:

WM. HUNTER MYERS, FRANK B. MARLOW.

